by Matthew Benjamin and Rich Miller

May 4 (Bloomberg) — Post-recession America may be saddled with high unemployment even after good times finally return.

Hundreds of thousands of jobs have vanished forever in industries such as auto manufacturing and financial services. Millions of people who were fired or laid off will find it harder to get hired again and for years may have to accept lower earnings than they enjoyed before the slump.

This restructuring — in what former Federal Reserve Chairman Paul Volckercalls “the Great Recession” — is causing some economists to reconsider what might be the “natural” rate of unemployment: a level that neither accelerates nor decelerates inflation. This state of equilibrium is often described as “full” employment.

Fallout from the recession implies a “markedly higher” natural rate of unemployment, says Edmund Phelps, a professor at Columbia University in New York and winner of the 2006 Nobel Prize in economics. “It was 5.5 percent; maybe it will be 6.5 percent, maybe 7 percent.”